Optimum Plot Size and Shape for Wheat Experimental Plot

Abstract

Wheat experiments for the optimum plot size and shape in field and rice field were conducted at Samoeng Upland Rice and Temperate Cereals Ex-eriment Station, Chiengmai and Phare Ric eResearch Centre in 1988 and 1989. At Samoeng, uniformity trials were used in both flat field and slope condition. Samoeng 1 vriety was row seeded with 25 cm. row space. Yields were harvested in basic unit of 1 m2 for each field (1440 b.u.) At Phrae, Samoeng-2 was planted on ridge of 2 m. width with 50 cm. wide furrow along the ridge and was harvested in basic unit of 75 cm. long across the ridge (342 b.u.). The 12% moistureadjusted weight yield was computed to the exponential equation wher Y = aXb which represented the relationship between the coefficient of variation and th eplot sizes. The rsults showed that the optimum plot size (harvested area) for wheat experiment in the field condidion should be 5m2 with rectangular shape whereas 2 plots of 2 m. width ridge with 3 m. long was the optimum plot size for the experiment in the rice field condition.